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Related Concept Videos

What is Variation?01:14

What is Variation?

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Apart from the measures of central tendency, distribution, outliers, and the changing characteristics of data with time, an important characteristic of any data set is its variation or spread. In some data sets, the data values are concentrated closely near the mean; in others, the data values are more widely spread out from the mean.
The range, standard deviation, standard error, and variance are the different measures of variation.
Range: The range is the difference between its maximum and...
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Short-distance Transport of Resources02:12

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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Variation01:19

Variation

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An important characteristic of any set of data is the variation in the data. In some data sets, the data values are concentrated closely near the mean; in other data sets, the data values are more widely spread out from the mean. The most common measure of variation, or spread, is the standard deviation, which is the square root of variance.
When independent and dependent variables are plotted on a scatter plot, the slope of a line is a value that describes the rate of change between the two...
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Conservative Site-specific Recombination and Phase Variation02:53

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
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Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

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Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
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Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Updated: Jan 31, 2026

Ensemble Force Spectroscopy by Shear Forces
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Ensembl variation resources.

Sarah E Hunt1, William McLaren1, Laurent Gil1

  • 1European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK.

Database : the Journal of Biological Databases and Curation
|December 22, 2018
PubMed
Summary
This summary is machine-generated.

Ensembl provides integrated genomic variation data and analysis tools. This helps researchers understand the links between genetic changes, traits, and diseases for individuals.

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Area of Science:

  • Genomics
  • Bioinformatics
  • Computational Biology

Background:

  • Understanding the relationship between genomic variation, phenotype, and disease is a major goal in sequencing efforts.
  • Existing variation resources are numerous but often non-homogeneous and challenging to integrate.
  • A systematic catalog and appropriate tools are crucial for interpreting individual genome sequences and assessing disease risk.

Purpose of the Study:

  • To address the challenge of integrating and accessing diverse genomic variation data.
  • To develop tools and methods for systematic cataloging, querying, and annotating genomic variation.
  • To facilitate a deeper understanding of the link between genomic variation, phenotype, and disease.

Main Methods:

  • Developing methods for data integration and broad access to genomic variation data.
  • Aggregating information from disparate sources into a consistent format.
  • Making data available in standard formats, both visually and programmatically.
  • Building analysis pipelines for variant comparison against comprehensive genomic annotation sets.

Main Results:

  • Ensembl offers a systematic solution for managing and accessing heterogeneous genomic variation data.
  • Integrated data and analysis tools are now publicly available.
  • Facilitated programmatic and visual access to aggregated genomic information.

Conclusions:

  • Ensembl substantially solves the challenge of making sense of large-scale, non-homogeneous genomic variation datasets.
  • Publicly available tools and data empower researchers to interpret genome sequences and assess disease risk.
  • Systematic data integration and analysis are key to advancing our understanding of genomics and disease.